Hi, I want to record the conversations that I and my friends are having with the Sena 30K intercom communication device intended for motorcyclists. In the attachment you can see the intercom device. As can be seen, the device consists of two parts. It has a part that attaches to the helmet to which the main unit is attached. It is responsible for the transmission of the sound coming via Bluetooth to the loudspeakers. As you can see in the picture, there is an external headphone output with a 3.5 mm jack. (In the place of earbud) My question is: I can record audio from the headphone output to an external recorder, but when I connect to the headphone jack, the speakers in the helmet are muted. So I can record the conversation, but I cannot communicate at the same time. When I last tried in a quiet environment, I noticed that the sound was not completely muted, but could be heard very quietly. This made me think there might be a way to increase the volume. Is there a way to prevent the speakers from being muted when the device's 3.5mm jack is connected to an external source? Can I prevent this with a simple intervention? In an US SENA forum, someone converted the Aux-In (marked as MP3 port in the photo) into an Aux-Out socket. That would also be an option if it cannot be done with too much know-how. I would be happy if those who have information or ideas on the subject could respond.
Ömer Yıldız wrote: > In an US SENA forum, someone converted the Aux-In (marked as MP3 port in > the photo) into an Aux-Out socket. That would also be an option if it > cannot be done with too much know-how. Can you please post a link to that forum thread? Maybe it's easy to do but too spread across that thread. br mf
Ömer Yıldız wrote: > My question is: I can record audio from the headphone output to an > external recorder, but when I connect to the headphone jack, the > speakers in the helmet are muted. So I can record the conversation, but > I cannot communicate at the same time. Many devices switch off the speakers while a jack is connected to the earphone plug. This is done by the earphone jack which has a switch inside (resp. two switches for left/right speakers) and disconnects then the outgoing signal to the speakers. Maybe you have the possibility to short this switch by a peace of wire so that it is always on. You need to be able to open your SENA device and find out the route of the signal from the amp to the speakers. I think, the speaker signal is routed from the power amp to this plug and than further to the speakers. Connect these wires. You should check before, which wires have a connection when the jack is out and if they are open, if the jack is plugged in. (Resistor measurement) Use for this test a dummy plug and ideally disconnect the speakers to avoid wrong measurements. Maybe the setup is different in your device, but I do not have more informations about it - it's only my suggestion. Perhaps a photo of the jack environment can help. So, it is also possible that a controller gets only a logic signal when the plug is pulled in and it switches off the amp or the connection to the speakers. Then you need to modify this logical signal. To amplify the weak signal for the speakers needs much more work.
Thanks for the quick reply. Well the problem is it was just a random guy who mentioned it. Unfortunately I could not find his post anywhere in the forum.
HildeK wrote: > > Maybe the setup is different in your device, but I do not have more > informations about it - it's only my suggestion. Perhaps a photo of the > jack environment can help. OK. I will disassemble the main unit and take pictures. Unfortunately i dont know anything about electronics. I can only solder. Thanks
Hi, this is what the inside of the Helmet Clamp looks like. Any toughts?
Ömer Y. wrote: > Any toughts? Not easy. Pic 3 shows the earbud connector. As I can see only one side of the plug and no PCB tracks, so it is hard to say more in a reliable statement. The 3.5mm jack has normally 3 connectios: left, right and GND. I can see three pads, but are there also 2 or 3 on the other side? The switch in pic. 2 is probably a pushbutton; it is not that switch I meant. This is a part of the earbud connector and breaks two contacts if a 3.5mm jack is inserted. Maybe these are the two left pads (and two on the other side) of the plug and the problem will be solved, if they are shortened. But as I am not shure about the details of the circuit, this may damage your device. So I will not advice doing this ...
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